kotlin.collections.lastIndex
lastIndex
val <T> List<T>.lastIndex: Int
Returns the index of the last item in the list or -1 if the list is empty.
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
println(emptyList<Any>().lastIndex) // -1
println(listOf("a", "x", "y").lastIndex) // 2
//sampleEnd
}
